Owner of a former president’s summer house seeks to triple his gains in two years Some market watchers are ruminating over whether a 300 percent price hike is justified for Chester A. Arthur’s former Sag Harbor home. (He was only president for two years, after all.) The house at 20 Union Street has hit the market for $14.2 million, as reported by Curbed, or more than three times what the owner paid in 2014.